Concrete Block Calculator Widget

Primary output —

Enter the wall length and height first. Use the openings option for doors or windows, then adjust waste, grout, and reinforcement assumptions if your project needs a fuller material list.

Wall length (required)

Wall height (required)

Nominal block size (required)

Waste allowance (%) (required)

Add openings and material details Hide openings and material details

Deduct openings (required)

Number of openings (required)

Opening width (required)

Opening height (required)

Mortar type (required)

Estimate grout fill (required)

Grout fill pattern (required)

Estimate reinforcement (required)

Specified vertical rebar spacing

Specified horizontal reinforcement spacing (required)

Project preset

Blocks to order

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Net wall area —

Show calculation details Hide calculation details

Wall area

Gross wall area —

Optional material takeoff

Mortar bags —

Grout core-fill —

Reinforcement planning

Notes —

More details